# In-Sight ViDi PC Tags and $ Functions

The In-Sight ViDi tags and $ functions (located in the Tags Window) allow you to interact with various components of the application while the vision system is online, and may be used in WebPage Elements bindings.

- Tags are named variables, and the data stored in a tag can be accessed and shared in the various subsystems of the application. The following icon denotes a tag:
- $ functions are system calls that are used to invoke actions within the subsystems of the application. The following icon denotes a $ function:

Note: You can drag-and-drop tags and $ functions to automatically create WebPage elements. See the Drag-and-Drop Tags to Web Pages topic for more information.